mineral
Polished tree agate (likely)
Chalcedony (microcrystalline SiO₂) with green dendritic/inclusion minerals
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; pale green to white mottled pattern, waxy-to-glassy luster, cryptocrystalline structure, and no visible cleavage. The rounded shape indicates a polished cabochon or tumbled stone.
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Physical properties
Hardness about 6.5–7 Mohs; pale green to white mottled pattern, waxy-to-glassy luster, cryptocrystalline structure, and no visible cleavage. The rounded shape indicates a polished cabochon or tumbled stone.
Formation & geological history
Forms when silica-rich fluids fill cavities and fractures, with green chlorite, epidote, or hornblende inclusions producing the mossy pattern; commonly associated with volcanic rocks, generally of varied Phanerozoic age.
Uses & applications
Used for cabochons, beads, carvings, and decorative objects; modest value as a lapidary stone and collectible.
Geological facts
The pattern is inclusion-based rather than true branching fossilized vegetation; similar material is often marketed as moss agate, tree agate, or fancy jasper.
Field identification & locations
Identify by its translucent-to-opaque chalcedony body, smooth polish, hardness, and irregular green inclusions; common sources include India, Brazil, Uruguay, China, and the United States. Exact identification requires examination of translucency and inclusions.
